Barretto, J.T. and Baluyot, S.C. 2010. Generalized Huygens-Fresnel integral for a single small aberration. Proceedings of the Samahang Pisika ng Pilipinas, 28(1), SPP-2010-6A-03. URL: https://proceedings.spp-online.org/article/view/SPP-2010-6A-03.